From 69ed779a1454d9a57ba3738135eec9be550e0613 Mon Sep 17 00:00:00 2001 From: David Rientjes Date: Mon, 10 Jul 2017 15:48:50 -0700 Subject: [PATCH] mm, hugetlb: schedule when potentially allocating many hugepages A few hugetlb allocators loop while calling the page allocator and can potentially prevent rescheduling if the page allocator slowpath is not utilized. Conditionally schedule when large numbers of hugepages can be allocated. Anshuman: "Fixes a task which was getting hung while writing like 10000 hugepages (16MB on POWER8) into /proc/sys/vm/nr_hugepages." Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1706091535300.66176@chino.kir.corp.google.com Signed-off-by: David Rientjes Reviewed-by: Mike Kravetz Tested-by: Anshuman Khandual Cc: Naoya Horiguchi Cc: "Aneesh Kumar K.V" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/hugetlb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 01c11ceb47d6..176e0318960f 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1781,6 +1781,7 @@ retry: break; } list_add(&page->lru, &surplus_list); + cond_resched(); } allocated += i; @@ -2249,6 +2250,7 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h) } else if (!alloc_fresh_huge_page(h, &node_states[N_MEMORY])) break; + cond_resched(); } if (i < h->max_huge_pages) { char buf[32]; -- 2.20.1